Protection Relay for undervoltage, overvoltage, undercurrent, overcurrent A protection relay specifically designed to monitor undervoltage, overvoltage, undercurrent, and overcurrent conditions in electrical systems is commonly referred to as a "multi-function" or "comprehensive" protection relay. This type of relay combines multiple protective functions into a single device, providing comprehensive protection for the electrical system. CNC Electric can just be your trustworthy brand for busines